Syncronization in JavaModelManager.PerProjectInfo looks fishy

If one looks at this code in PerProjectInfo

https://github.com/eclipse-jdt/eclipse.jdt.core/blob/8944c910d454bf2c5656d186b09a3efc33733fc8/org.eclipse.jdt.core/model/org/eclipse/jdt/internal/core/JavaModelManager.java#L1397-L1410

there is a possible synchronization problem.

Assume two threads are entering the method and the first one enters the synchronized and advances to line 1405 and now the second thread goes to line 1397 then it might fetch a delta state that contains new values for

- referencedEntries
- newRawClasspath
- newOutputLocation
- rawClasspathStatus

but old one for `resolvedClasspath` and following...

So either there is a race condition here, or only one thread is ever calling the method so the synchronized is obsolete.